This model of two neighboring pancreas precursor cells describes the exocrine versus endocrine lineage specification process as studied in
W. de Back, J.X. Zhou, L. Brusch (2012) On the role of lateral stabilization during early patterning in the pancreas. J. R. Soc. Interface.
To account for the tissue scale patterns as studied in the paper, this couplet model has been extended to hundreds of coupled cells and stochstic terms were added.